21111122222223 has 16 divisors (see below), whose sum is σ = 30707195095296. Its totient is φ = 12794574434240.

The previous prime is 21111122222191. The next prime is 21111122222261. The reversal of 21111122222223 is 32222222111112.

It is a cyclic number.

It is not a de Polignac number, because 21111122222223 - 2⁵ = 21111122222191 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21111122222193 and 21111122222202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111122222123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10023886 + ... + 11945732.

It is an arithmetic number, because the mean of its divisors is an integer number (1919199693456).

Almost surely, 2^{21111122222223} is an apocalyptic number.

21111122222223 is a deficient number, since it is larger than the sum of its proper divisors (9596072873073).

21111122222223 is a wasteful number, since it uses less digits than its factorization.

21111122222223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2254734.

The product of its digits is 768, while the sum is 24.

Adding to 21111122222223 its reverse (32222222111112), we get a palindrome (53333344333335).

The spelling of 21111122222223 in words is "twenty-one trillion, one hundred eleven billion, one hundred twenty-two million, two hundred twenty-two thousand, two hundred twenty-three".